21005920

素因数分解:

$2^5\times 5^1\times {\mathrm{13}}^1\times {\mathrm{10099}}^1$

素因数の和:10127

約数の個数: 48

約数和(自身を含む): 53449200

約数和(自身を除く): 32443280

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 65, 80, 104, 130, 160, 208, 260, 416, 520, 1040, 2080, 10099, 20198, 40396, 50495, 80792, 100990, 131287, 161584, 201980, 262574, 323168, 403960, 525148, 656435, 807920, 1050296, 1312870, 1615840, 2100592, 2625740, 4201184, 5251480, 10502960, 21005920]

約数ペア:

[(1, 21005920), (2, 10502960), (4, 5251480), (5, 4201184), (8, 2625740), (10, 2100592), (13, 1615840), (16, 1312870), (20, 1050296), (26, 807920), (32, 656435), (40, 525148), (52, 403960), (65, 323168), (80, 262574), (104, 201980), (130, 161584), (160, 131287), (208, 100990), (260, 80792), (416, 50495), (520, 40396), (1040, 20198), (2080, 10099)]